Chimney-cap



(No Model.) D BARTLETT.

Chimney Cap.

- No. 232,434. Patented S ept. 2|, I880.

. WITNESSES: .INVE TOR:

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UN TED STATES PATENT QFFICE.

WILLIAM D. BARTLETT, OF AMESBURY, MASSACHUSETTS.

CHIMNEY-CAP.

SPECIFICATION formingpart of Letters Patent No. 232,434, dated September21, 1880. Application filed June 12, 1880. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM D. BARTLETT, of .Amesbury, in the county ofEssex and State of Massachusetts, have invented a new and usefulImprovement in Chimney-Gaps, of which the following is a specification.

The object of my invention is to furnish a chimney-cap which shallinsure a good draft to thechimney at all times and prevent back draftsby sudden gusts or changes of wind.

As heretofore constructed chimney-caps, though they work well underordinary circumstances, fail in high winds or in winds blowing fromcertain directions, according to the locality, and such failure can onlybe prevented by closing the windward apertures of the cap or so breakingup the gusts of wind that its force is dissipated. This I accomplish bymy invention, which consists in a perforated conical cap closed at thebottom and forming a housing around the escape-flue,

which cap is fitted with a perforated conical hood that is slightlylarger than the-fixed cap, and is hung loosely at its apex, so that itmay swing freely. The holes in the hood do not register with.those inthe fixed cap, so that as the hood is pressed by the wind against thecap the openings are closed on the windward side, while there is freeexit at the opposite side.

The construction and operation will be more particularly explainedhereinafter with reference to the accompanying drawing, wherein I haveshown a vertical section of a chimneycap embodying my. invention.

A is the base, of a form adapted for resting on the chimney, and fittedwith the flue-pipe a, of suitable length.

B is the fixed cap, made in conical form, and attached by its bottomplate, b, to the pipe to, so that the upper end of the pipe is housed bythe conical cap.

The bottom I) is preferably made in the -inclined or tapering formshown, and atits lower portion, around pipe a, there is fixed a lip orflange, c, that serves to direct outward from pipe at any water thatruns down upon the under side of bottom b.

The conical cap B is perforated with numerous openings from its base tonear the top,

and in the lower portion of the bottom plate, I there is a row ofopenings, d. Upon the fixed cap B ishung the conical hood I), whichcorresponds in length to the cap B, but is of greaterdiameter at thebase-say about two inches greater.

The hood 0 is shown as suspended by simply resting at its apex on theapex of the cone B, a screw-pin, c, being fitted in cone B, and providedwith a nut, f, for retaining the hood upon the fixed cap. The hood 0may, however, be suspended in any other desired manner permitting it toswing freely. The hood 0 is also perforated similarly to the fixed capB; but the perforations are over the closed portions of the cap, so thatthe openings may not coincide. By this construction, when there islittle or no wind, the hood 0 hangs clear of the cap .13 and there isfree exit at all sides.

In case of high winds or sudden gusts of wind the hood will be forcedagainst the cap at the windward side, thereby closing the openings atthat side and giving more free vent at the leeward side. Any wind thatenters between these two points will be broken up and filtered throughthe openings, so that itwill not affect the draft. This cap acts alsomost effectually in killing or smothering sparks as they are forced incontact with the sides of the cap and hood.

The bottom of the capB will be washed out at every rain by the waterrunning in at the openings of the cap and out at the openings 01.

If desired, there may be a flange or gutter secured outside the base ofcone B to turn the rain into the cap more elfectually.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. The chimney-cap consisting of the escape-flue a, perforated and fixedconical cap B, provided with bottom 6, and perforated and suspended hood0, combined for operation as specified.

2. The combination of perforated cap B, bottom b, with openings (1,perforated hood 0, and pipe at, substantially as specified.

The above specification of my invention signed by me this 4th day ofJune, 1880.

WILLIAM D. BARTLETT.

Witnesses:

G. SEDGWICK, GEO. D. WALKER.

